The stock market in India experienced a sudden change in sentiment following a significant crash on February 19, which carried over into the initial trading of February 20. Both the Sensex and Nifty opened in the negative, showing early signs of a continued downturn. However, this trend quickly reversed as the trading session progressed, turning the mood on the market bullish again.

As the trading session unfolded, the Sensex made a remarkable recovery, surging up by 400 points, which indicates strong buying interest and market confidence returning. Investors seemed to respond positively to various factors, possibly including government interventions or positive developments in other economic indicators. The market's ability to rebound from prior losses highlights the volatility common within stock indices, particularly in response to investor sentiment and news events.

The implications of this turnaround are significant for both retail and institutional investors. A quick recovery might encourage more investors to enter the market, seeking opportunities during volatile periods. Additionally, the resilience of market indices like the Sensex can impact overall economic sentiment and investment flows into India, reinforcing the dynamics of the financial landscape in the country.